Hi everyone.
This question has been asked many times, but I didn't think I would be in the predicament, what is the best and quickest way of getting a onwards flight just to show the airline, I'm in UK and fly in the morning, thanks .
TLDR : Answer Summary
The question revolves around finding a quick and efficient way to procure an onward flight ticket to satisfy airline check-in requirements prior to traveling to Thailand. Multiple suggestions arise in the comments, including purchasing a refundable ticket or using websites that provide temporary onward travel options. There is a discussion regarding whether airlines are strict about requiring proof of onward travel, with various personal experiences shared that indicate inconsistency in enforcement. Ultimately, the consensus is that while many travelers manage to board flights without an onward ticket, having one minimizes the risk of being denied boarding.